In this case, police said one girl stabbed the other nine times, killing her. And the girls hadn't even reached high school.

Sydney Dailey, 13, was outside on the front porch of her family's home Saturday evening, talking with two girls she knew from school, her mother, Tanikka West said Sunday afternoon.

She'd had an ongoing dispute over a boy with one of the girls, Montoya Harris, for about a month. Both girls went to Madison Middle School.

But the girls were getting along when West and her husband, Carver West, went to the grocery store, leaving Sydney and her two older brothers at home. They hadn't even made it to the store when one of the boys called her.

"Them girls did something to Sydney. You need to come home. She's bleeding, bleeding bad,” one of the boys said, Tanikka West recalled.

When she returned, paramedics were attending to her daughter on the porch. She had been stabbed nine times, twice in the heart. She went into cardiac arrest and died at St. John Medical Center about an hour after the attack.

Tulsa police Detective Vic Regalado said Harris, 14, has been arrested on suspicion of first-degree murder and is being held at the Tulsa County jail.

West said her daughter and the girls stayed outside on the porch because of one of her rules: no friends inside the house. Sydney also followed another of her mother's rules: no boyfriends.

"We don't play that boyfriend/girlfriend stuff. You're 13 years old,” West had told her. She wasn't dating the boy this whole dispute was about, West said. He was just a friend.

What happened?

Regalado said Harris and the other girl went to Sydney's home to confront her about 7:30 p.m. After the stabbing, someone picked up Harris and the other girl and drove them from the scene, he said.